Model 4700 Maintenance Manual
Section 8. Theory of Operation
Single Traction Motor Trucks >S/N 10676 Item
Connection
Function Description
Theory of Operation
Pinout Matrix Normal Level
Signal Source
Signal User
321
J409-A
NOT USED
322
J409-B
+V POT
Voltage to the 4th Aux pot (P7). If not present, check the Armrest Board, wiring, and connections. Note: This switch is internal to the Fingertip Module. If switch is bad, replace the module.
Approx. 5V
Armrest Board
4th Aux Fingertip Module
323
J409-C
C POT
Output from the 4th Aux pot (P7) wiper to the Armrest Board. If not present, check P7, wiring, and connections. Note: Check P7 by disconnecting it from the circuit and reading across it. Approx. 4K ohms should be read across JIV-1 and 4.
Approx. 2.5V in neutral; range 0V to 5V
4th Aux Fingertip Module
Armrest Board
324
J409-D
GND POT
Ground to the 4th Aux pot (P7). If not present, check the Armrest Board, wiring, and connections.
Battery voltage wrt BT1+
Armrest Board
4th Aux Fingertip Module
325
J409-E
MICRO
Input from 4th Aux pot (P7) directional switch (SW23). If not present, check switch, wiring, and connections.
Approx. 5V closed; 0V open
4th Aux Fingertip Module
Armrest Board
326
J409-F
MICRO
Input from 4th Aux pot (P7) directional switch (SW24). If not present, check switch, wiring, and connections.
Approx. 5V closed; 0V open
4th Aux Fingertip Module
Armrest Board
327
J409-G
GND
Ground to 4th Aux pot (P7) directional switches (SW23 and SW24). If not present, check the Armrest Board, wiring, and connections.
Battery voltage wrt BT1+
Armrest Board
4th Aux Fingertip Module
328
PPA B+
B+
B+ from the battery to the PPA through fuse FP. If not present, make sure the battery is connected. Check fuse, wiring, and connections.
B+
J1+
PPA
329
PPA B–
B–
B– from the battery to the PPA. If not present, make sure the battery is connected. Check wiring and connections.
Battery voltage wrt BT1+
BT1
PPA
330
PPA (U)
PPA (U)
One of three phases from the PPA to the Pump Motor. Voltage is measured between any two phases. If not present, check the PPA, wiring, and connections.
0 to approx. 20VAC; Approx. 200A ramping; Approx. 250A full lift
PPA
PM
Publication 1160093, Issued: 20 May 2013
8-75
